Part 4 of our Domain Statistics & Numbers article series breaks down the size of generic top-level domain (gTLD) namespaces:

1. How many top-level domain name extensions exist in total?
2. How many domains are registered worldwide?
3. What are the Top 10 global domain extensions?
4. How big are the generic top-level domain (gTLD) namespaces?
5. What is the ranking of my country code top-level domain (ccTLD)?

4. How big are the generic top-level domain (gTLD) namespaces?

A useful resource for these domain name statistics is the ICANN Dashboard which provides an interactive timeline on the growth of generic TLDs.

.AERO - .MOBI interactive timeline or click for larger view:

.MUSEUM - .TRAVEL interactive timeline or click for larger view:

Further information about the fluctuation in these graphs can be found directly on the ICANN Dashboard.

The number of registered gTLDs and their ranking is as follows:

1. .COM: 82.01 million
2. .NET: 12.42 million
3. .ORG: 7.79 million
4. .INFO: 5.24 million
5. .BIZ: 2.03 million
6. .MOBI: ~ 850.000
7. .NAME: ~ 300.000
8. .TEL: ~ 220.000
9. .ASIA: ~ 210.000
10. .TRAVEL: ~130.000
11. .CAT: ~38.000
12. .PRO: ~37.000
13. .JOBS: ~16.000
14. .AERO: ~6.500
15. .COOP: ~5.800
16. .MUSEUM: ~550

Total number of generic domain extensions (September 2009): 111.3 million

Sources: DomainesInfo Statistiques, ICANN Dashboard